Why is a clay stove much more efficient than a wood burning stove?

In contrast to a normal wood-burning stove, the Tonwerk storage stove applies: "Heat up once and forget". With a load of wood weighing 6 kg, you can enjoy pleasant warmth for up to 16 hours. With a stove, on the other hand, wood is added up to 10 times for 16 hours of heat release. This corresponds to a wood consumption of about 15 kg.